Detect proxies is an important issue in testing the discriminatory behavior of an algorithm. It is helpful for identifying fraudulent agents and reducing compliance risks.
How do I find proxies?
Proxy use can be detected by examining the HTTP headers. They often contain x-forwarded-for entries, and indicate a proxy connection.
Using a third-party API service can also help with this problem. It can perform a more unique test, and avoid false positives. This way, you get accurate information on the IP reputation of your users, while avoiding headaches from spammers and fraudsters.
Another useful method is to check whether a server is receiving a lot of requests. If it is, there is a good chance the IP address is open poxy.
Fraudsters often browse the internet using proxies, which hide the details of their connection. While some proxies are legitimate and beneficial, others are more dangerous.
These proxies can be used for malevolent actions, such as redirecting your session to another IP address. To prevent this, you can ask politely if your computer is using a proxy.
Aside from the proxy header, you can also check the type of IP address. Residential IPs are more trustworthy. Typically, they are owned by well-known ISPs. On the other hand, datacenter IPs are less trustworthy.
Proxy detection also adds the dimension of time. You can detect a proxy if your browser timezone differs from the IP’s. Also, consider checking the server’s ping times.
Another way to determine if a server is receiving a large number of requests is to look at its port. Some proxies have ports that aren’t used by other users.
